x-y=9,xy=5,求x²+y²的值

来源：学生作业帮助网 编辑：作业帮 时间：2024/07/08 15:39:31
x-y=9,xy=5,求x²+y²的值
x)Эԩ5yBMZB?aMR>Q lH0U,f5hj90iJM>%LtSTF 1:|K

x-y=9,xy=5,求x²+y²的值
x-y=9,xy=5,求x²+y²的值

x-y=9,xy=5,求x²+y²的值
x²+y²
=(x²-2xy+y²)+2xy
=(x-y)²+2xy
=9²+2×5
=81+10
=91